WhatsApp for Xiaomi Mi A1 (5X)

This was a known WhatsApp image-processing bug that affected some devices, where WhatsApp's re-encoding of the JPEG introduced a green or pinkish color shift. The most reliable fix is to send the picture as a document instead of a photo (tap the paperclip > Document > browse and pick the image), which sends it uncompressed and unaltered. Also update WhatsApp to the latest version from the Play Store, since later releases corrected the tint. If only the in-app preview looks off, clearing the cache under Settings > Apps > WhatsApp > Storage > Clear cache can refresh the thumbnail. See how others solved this on Reddit

Android's battery optimization is throttling WhatsApp in the background, which is the usual cause of delayed message and call notifications on the Mi A1. Go to Settings > Apps > WhatsApp > Battery (or Settings > Battery > Battery optimization) and set WhatsApp to 'Don't optimize' / 'Unrestricted', then make sure notifications are enabled under Settings > Apps > WhatsApp > Notifications. Also confirm background data is allowed under Settings > Apps > WhatsApp > Mobile data & Wi-Fi > Background data, since restricting it stops push notifications. See how others solved this on Reddit

The Mi A1 ships with a small amount of Xiaomi bloatware, and most of it can be uninstalled or disabled normally even though it runs stock Android One. Long-press the app icon and choose App info, then tap Uninstall, or if Uninstall is greyed out, tap Disable to stop it running and hide it. For anything that keeps coming back, open Settings > Apps, select the app, and revoke its background and notification permissions to keep it quiet. See how others solved this on Reddit

This is 2.4GHz interference: WiFi and Bluetooth both use the 2.4GHz band, so an active Bluetooth connection can drag down WiFi throughput on the Mi A1. Switch your router to the 5GHz band and connect the Mi A1 to that SSID, since 5GHz doesn't clash with Bluetooth. If you only have 2.4GHz, turn Bluetooth off when you need fast WiFi, or set a fixed router channel (1, 6, or 11) to reduce the overlap. See how others solved this on Reddit

This happens when WhatsApp notifications don't clear properly on the phone, so the band replays stale ones. On the Mi A1, grant the Mi Fit app notification access under Settings > Apps > Special app access > Notification access, then in Mi Fit enable WhatsApp under Notifications > App alerts. Clear WhatsApp from recents and toggle the band's notification setting off and on to resync. Keeping WhatsApp set to 'Unrestricted' in battery settings also prevents the backlog that causes repeats. See how others solved this on Reddit